<template>
  <div class="flow-menu" ref="tool">
    <div v-for="menu in meList" :key="menu.id">
      <span class="ef-node-pmenu" @click="menu.open = !menu.open"
        ><i
          :class="{
            'el-icon-caret-bottom': menu.open,
            'el-icon-caret-right': !menu.open,
          }"
        ></i
        >&nbsp;{{ menu.name }}</span
      >
      <ul class="ef-node-menu-ul">
        <draggable
          @end="end"
          @start="move"
          v-model="menu.children"
          :options="draggableOptions"
        >
          <li
            v-for="subMenu in menu.children"
            class="ef-node-menu-li"
            :key="subMenu.id"
            :type="subMenu.id"
          >
            <svg-icon :icon-class="subMenu.ico" style="padding-right: 2px" />{{
              subMenu.name
            }}
          </li>
        </draggable>
      </ul>
    </div>
  </div>
</template>
<script>
import { listPlugin } from "@/api/plugin/plugin";
import draggable from "vuedraggable";

var mousePosition = {
  left: -1,
  top: -1,
};

export default {
  data() {
    return {
      activeNames: "1",
      // draggable配置参数参考 https://www.cnblogs.com/weixin186/p/10108679.html
      draggableOptions: {
        preventOnFilter: false,
        sort: false,
        disabled: false,
        ghostClass: "tt",
        // 不使用H5原生的配置
        forceFallback: true,
        // 拖拽的时候样式
        // fallbackClass: 'flow-node-draggable'
      },
      // 默认打开的左侧菜单的id
      defaultOpeneds: ["1", "2"],
      meList: [],
      nodeMenu: {},
    };
  },
  components: {
    draggable,
  },
  created() {
    /**
     * 以下是为了解决在火狐浏览器上推拽时弹出tab页到搜索问题
     * @param event
     */
    if (this.isFirefox()) {
      document.body.ondrop = function (event) {
        // 解决火狐浏览器无法获取鼠标拖拽结束的坐标问题
        mousePosition.left = event.layerX;
        mousePosition.top = event.clientY - 50;
        event.preventDefault();
        event.stopPropagation();
      };
    }
    this.getList();
  },
  methods: {
    /** 查询插件列表 */
    getList() {
      listPlugin()
        .then((response) => {
          let data = response.data;
          this.meList = data;
        })
        .finally(() => {});
    },
    // 根据类型获取左侧菜单对象
    getMenuByType(id) {
      for (let i = 0; i < this.meList.length; i++) {
        let children = this.meList[i].children;
        for (let j = 0; j < children.length; j++) {
          if (children[j].id == id) {
            return children[j];
          }
        }
      }
    },
    // 拖拽开始时触发
    move(evt, a, b, c) {
      var type = evt.item.attributes.type.nodeValue;
      this.nodeMenu = this.getMenuByType(type);
    },
    // 拖拽结束时触发
    end(evt, e) {
      if (!this[this.nodeMenu.name]) {
        this.$message.warning({
          title: "提示",
          message: "组件尚未开发完成",
          type: "alert",
        });
        return;
      }
      this.$emit("addNode", evt, this.nodeMenu, mousePosition);
    },
    // 是否是火狐浏览器
    isFirefox() {
      var userAgent = navigator.userAgent;
      if (userAgent.indexOf("Firefox") > -1) {
        return true;
      }
      return false;
    },
  },
};
</script>
